Enhanced cross-polarization isolation of loop-dipole antenna array backed by dielectric cavities for 5G base stations

Yiran Da, Xiaoming Chen, Mengting Li, Zhenyuan Zhang, Azremi Abdullah Al-Hadi, Anxue Zhang and Ahmed A. Kishk

Journal of Electromagnetic Waves and Applications, 2021, vol. 35, issue 15, 2034-2050

Abstract: Various decoupling methods were proposed and investigated for multiple-input multiple-output (MIMO) Base Station (BS) systems. These methods can effectively decouple the dual-polarized co-polar signal but fail to decouple the cross-polarized signal, similarly limiting the BS's overall decoupling performance. In this paper, different antenna arrays are designed to illustrate the coupling mechanism of cross-polarized BS antennas, and a comprehensive study of the relationship between antenna configurations and mutual couplings is conducted. It is shown that compact size antenna elements enlarge the edge-to-edge separation, and the loop-shaped dipole elements reduce the cross-polarization couplings. Finally, the array-antenna decoupling surface (ADS) method is applied in a 2×2 array composed of the designed antennas. Thanks to the improved antenna unit, the decoupling task is eased, and a better decoupling performance is achieved compared with the original ADS work.

Date: 2021
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DOI: 10.1080/09205071.2021.1929507

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